Diff: HCSR04.cpp

Revision:

0:d9d8c810ba83

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HCSR04.cpp	Sun Jul 27 20:42:24 2014 +0000
@@ -0,0 +1,33 @@
+#include "mbed.h"
+#include "HCSR04.h"
+
+HCSR04::HCSR04(PinName pin_trigger, PinName pin_echo, float &container_var):
+caller(pin_trigger),
+listener(pin_echo){
+    range_storage = &container_var; //check how it's done
+    listener.rise(this, &HCSR04::start_counting);
+    listener.fall(this, &HCSR04::stop_counting);
+    time_keeper.start();    
+}
+
+void HCSR04::start_measurement(void){
+    caller = 1;
+    controller.attach_us(this, &HCSR04::stop_calling, TRIGGER_TIME);    
+}
+    
+void HCSR04::stop_calling(void){
+    caller = 0;
+    controller.detach();   
+}
+
+void HCSR04::start_counting(void){
+    time_keeper.reset();   
+}
+
+void HCSR04::stop_counting(void){
+    float temp_range  = (float)time_keeper.read_us()/58.0f; //convert to centimeters
+    if (temp_range < MAX_RANGE)
+        *range_storage = temp_range;
+    else
+        *range_storage = -1.0;
+}
\ No newline at end of file